air cooled engine technology · air cooled engine technology test #3 review covers chapters 9 &...

AirCooled Engine Technology


Test #3 Review

Covers Chapters 9 & 14 OEM Electrical Worksheets

Electrical Tools Electrical Circuit Troubleshooting

Test #3 Format ≈ 65 Questions True & False

Matching Definitions Short Answer

Electrical System Part Identification Tuneup & Electrical Service Procedures Questions About Electrical Bench Work


Best Way To Study Use Chapters 9, 14, OEM Manual Multimedia!!

Take Notes from Study Guides & Textbook!

From Chapter 9 Study Guide

1. Ignition System Job #1: Transform! 2. Ignition System Job #2: Time the Spark! 3. Maximum Voltage (kV) and Why it’s Needed

From Chapter 9 Study Guide 4. Magneto Ignition System 5. Parts of a Magneto Ignition System 6. Breaker Magneto vs. Electronic Magneto

From Chapter 9 Study Guide 7. Atoms 8. Electrons 9. Insulators & Conductors & SemiConductors


10. Making Electricity 11. Mechanical 12. Chemical


13. Volts, Amps, Ohms, Watts

Volts = Push Amps = Flow Rate Ohms = Resistance

From Chapter 9 Study Guide 13. Volts, Amps, Ohms, Watts 14. Amps: Intensity, Rate of Flow, Current Flow 15. Volts: Pressure, Push, EMF 16. Ohms: Opposite of Flow, Resistance to Flow Ω

From Chapter 9 Study Guide 17. Ohm’s Law Formulas: 18. Circuit Requirements & Conditions:

Consumer has Resistance & Names the Circuit Source has Voltage Conductive Path Carries the Current Flow

Closed Continuity

Open No Continuity

From Chapter 9 Study Guide 19. Induction with Magnetic Fields 20. Moving a Coil 21. Moving a Magnetic Field 22. Increase or Decrease Changes Output 23. Making an Electromagnetic Field

Inducing Electricity by Moving

Magnetic Fields through Coils of Wire

Making a Magnetic Field by Applying Battery Voltage

to a Coil of Wire

From Chapter 9 Study Guide 24. Ignition Coil is a Transformer 25. Iron Magnetic Characteristics & Armatures 26. Primary & Secondary Transformer Coils 27. Where does the Secondary Output Lead To?

Retrofit Kit


28. Spark Plug Ceramic Insulator 29. Flashover/Shorting & Reason for Ribs 30. Adjusting Spark Plug Gap 31. Thread Reach = Length of Threads


32. Heat Range 33. HotRunning = Long Insulator Nose Path 34. ColdRunning = Short Insulator Nose Path

From Chapter 9 Study Guide 35. Electrode Designs Vary 36. Breaker Points = Mechanically Open Primary 37. Tungsten Coating on Points: Don’t File Them Clean 38. Condenser (capacitor) Prevents Arcing 39. Stop Switch: Primary ShorttoGround

A Shutoff Switch is a ShorttoGround

From Chapter 9 Study Guide 40. Circuit Requirements

Consumer, Source, Conductive Path

41. Circuit Types Series, Parallel, SeriesParallel

42. Circuit Problems Opens, Shorts, High Resistances

From Chapter 9 Study Guide 40. Circuit Requirements

Consumer, Source, Conductive Path

Consumers Resistance

Source Voltage

Conductive Path All the Parts that Carry the Amps

From Chapter 9 Study Guide 41. Circuit Types

Series, Parallel, SeriesParallel

From Chapter 9 Study Guide 42. The 3 Basic Circuit Problems 1) OPENS (no continuity) 2) SHORTS (either to a source of voltage or to a ground)

(on all of the time or off all of the time) 3) HIGH RESISTANCE (reducing the intensity or current flow in the circuit)


43. Spark Advance 44. Dwell: Coil Magnetic Field Saturation Time

The advancingstyle Magnetron ® ignition system uses a silicon

controlled rectifier (SCR) that advances ignition timing as rpm increases.

This device is generally used in switching applications. In the normal "off" state, the device restricts current to the leakage

current. When the gatetocathode voltage exceeds a certain

threshold, the device turns "on" and conducts current. The device will remain in the "on" state even after gate current is removed so long as current through the device remains above the holding current. Once current falls below the holding

current for an appropriate period of time, the device will switch "off". If the gate is pulsed and the current through the device is below the latching current, the device will

remain in the "off" state.

From Chapter 9 Study Guide 46. Solid State = Electronic = No Moving Parts 47. CDI Ignition: Fires on Primary Buildup!


48. Schematic Symbols – just be aware of them… 49. Battery as a Source for the Primary Coil


50. Battery Theory: 2 Dissimilar Metals in Acid


1. Why Tuneup? (Less Fuel Used, Better Performance, Lower Emissions) 2. Spark Plug: kilo Volts & who controls/demands it 3. Used Plug requires more kV to fire! 4. Visually Examine the Plug! Get the Story!

From Chapter 14 Study Guide 6. No Abrasive Blasting to Clean Spark Plugs 7. Use a Wire Feeler Gauge to Gap Plugs 8. Plugs are Sealed with Tapered Seat or Washer

From Chapter 14 Study Guide 10. Armature Air Gap Reduces Reluctance 12. Sheared Key Changes Timing of Spark

Causes of Sheared Key (righty/tighty, lefty/loosey) 13. Breaker Shear = No Spark

Electronic Shear = Wrong Time

From Chapter 14 Study Guide 14. Primary Coil: Low Volts & Low Ohms Ω 15. Secondary Coil: High Volts & High Ohms Ω 16. Capacitance in μ Farads – ability to absorb

From Chapter 14 Study Guide 23. CPSC Blade Brake Requirement (3 seconds) 24. CPSC Interlocks on varieties of equipment

Mowers, Snow Throwers, Riding Mowers, Tractors, Chainsaws, Augers, Thatchers, Flymo ® , etc.

24. Interlocks may be ignition, or cranking: Low Oil, Seat Switch, Clutch, PTO, Brake, Chute, Operator Presence in general…


26. Battery Temperature & Efficiency 27. Wire Sizes: American Wire Gauge # System


31. Charging System Stator & Diode Use 32. The 3 Circuit Problems: Troubleshooting

Opens

Shorts to Ground Shorts to Power Shorted Coils

High Resistances

From Briggs & Stratton Electrical Chapter

3. Spark Tester in Series: Running or Cranking


4. No Abrasive Blasting! 5. Reason for Resistor Spark Plugs (reduce RFI)

14. Switch Testing: Continuity & No Continuity 15. Cut the Spark & Brake the Flywheel (3 seconds)


3. Ignition & Cranking Interlocks 4. Diode Theory 5. Full & HalfWave Rectification of AC to DC A Good Diode Tests: .4 to .7 forward & OL reverse

From Tecumseh Electrical Chapter

7. Wiring Diameter & Gauge Numbers 9. Low Oil Shutdown Interlock 10. CPSC – 3 second blade stop time (from 215 MPH!)

12. CPSC – 19,000 feet/minute maximum blade RPM


13. CDI Electronic Ignition 14. Replace Points & Condenser as a Pair 18. Sheared Key & Kickback vs. Lack of Power


20. All Original Equipment Manufacturer Say: “No Abrasive Blasting!” “Spend the Money!”

2122. What is Spark Plug “Fouling” What causes Spark Plug Fouling?


Tools to Know & Know How to Use

Spark Tester

Understand the use a Digital MultiMeter to:

Measure Ignition Coil Resistances

Check the Operation of a Switch 2 ways

Measure Resistance of Stator Coils

Check a Diode

Forward Bias .4 to .7 volt drop

Reverse Bias OL (blocking flow)

Be able to explain that: a diode is used to Rectify AC to DC in a charging system

Know the parts of a Spark Plug

Especially the reason for:

Ceramic Insulator

Insulator Ribs

Thread Reach

Insulator Nose

Side Electrode

Center Electrode

Sealing Method – washer or taper

Quiz Yourself

Test #3 Electrical Parts


These are:

Points & Condenser Charging Stators Armatures Modules

These are:

Points & Condenser Charging Stators Armatures Ignition Modules

These are:

Points & Condenser Switches Armatures Ignition Modules

These are:

Points & Condenser Rotors & Stators Diodes & LED’s Flywheels & Keys

These are:

Spark Plugs CPSC’s Armatures Ignition Coils

air cooled engine technology · air cooled engine technology test #3 review covers chapters 9 &...

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